Good ideas, and here is another: get a wall plug with on/off switch at Home Depot for around two bucks or less that you can plug Echo into and can turn off at bedtime. Most all my gadgets without power switches are plugged into these, most so when gadget needs rebooting I don't have to yank the power cord from wall, I just use the switch. My Echo is in one.
Most of all, don't let the power company prevent you from having the gadgets you want. If it is so bad, have the power company check things out for your home or neighborhood. Unacceptable service. We don't have these issues in WA.